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Do you realize that the 24c04 is technically different to the 24c256? You can't just whack in the 24c04 and hope for the best - it won't work without modifying the software. The 24c04 is cumbersome to work with compared to the 24c256. Byte sized addressing and bank switching complicate a relatively simple need.Originally Posted by precision
Last edited by T.Jackson; - 19th April 2007 at 09:12.
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Greetings Trent,
I am now starting to build your project, I'm on stage one building 4017 sequencer. I have some question, is it possible to extend it for more characters, as of now it has seven character i want to extend it for more characters. can you please guide or give some example on how to do it. Thanks in advance....
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I don't recommend cascading anymore sections. The duty cycle is extremely low as it is. About 2.5% for each column. What this all means is that the LEDs won't be bright enough if more columns are added.
If you want to build a really huge display with a 100 or so columns, your best bet would be to use a few PIC16f877's. Break it into 4 sections - 25 columns for ea controller. The display will be nice & bright this way. Big job!
The hardest part will be in the software, making sure that ea section is properly synchronized with minimal latency. Shuffling data between ea section. On second thought - it's a masive job to do properly.
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Pictures of prototype
I just scanned in a few pics of the original prototype - thought I'd upload them.
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1563&d=1177470983" align="left">
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1564&d=1177471027">
Not bad for a single sided PCB huh?
Last edited by T.Jackson; - 25th April 2007 at 08:29.
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WOW... Cool and awesome design. Trent is it possible for you to feature here your PCB layout? I know how hard you work for it, just a humble and simple request... Thanks in advance.
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Unfortunately I can't offer the PCBs. Main reason, the Protel libraries that I used
aren't mine. They are owned by Silicon Chip publications.
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How do they do it?
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Here you can buy one pre-made that's bigger, better and brighter for less money. Like I said before - DIY is history...
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<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=1572&stc=1&d=117757599 2">
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Few years back something like this would have cost many hundreds of dollars
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Last edited by T.Jackson; - 26th April 2007 at 09:38.
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